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Re: [Qemu-devel] [PATCH v5 01/10] vl: Don't allow CPU toplogies with par
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH v5 01/10] vl: Don't allow CPU toplogies with partially filled cores |
Date: |
Wed, 2 Dec 2015 14:52:39 +0100 |
On Fri, 20 Nov 2015 18:24:30 +0530
Bharata B Rao <address@hidden> wrote:
> Prevent guests from booting with CPU topologies that have partially
> filled CPU cores or can result in partially filled CPU cores after
> CPU hotplug like
>
> -smp 15,sockets=1,cores=4,threads=4,maxcpus=16 or
> -smp 15,sockets=1,cores=4,threads=4,maxcpus=17.
CCing Eduardo who might tell if it's ok wrt x86
>
> Signed-off-by: Bharata B Rao <address@hidden>
> ---
> vl.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/vl.c b/vl.c
> index 7d993a5..23a1a1e 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1248,6 +1248,15 @@ static void smp_parse(QemuOpts *opts)
> exit(1);
> }
>
> + if (cpus % threads || max_cpus % threads) {
> + error_report("cpu topology: "
> + "sockets (%u) cores (%u) threads (%u) with "
> + "smp_cpus (%u) maxcpus (%u) "
> + "will result in partially filled cores",
> + sockets, cores, threads, cpus, max_cpus);
> + exit(1);
> + }
> +
> smp_cpus = cpus;
> smp_cores = cores > 0 ? cores : 1;
> smp_threads = threads > 0 ? threads : 1;